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Influence of Light Regime on the Success of Adaptation of Pike (\kur{Esox lucius}) Larvae on Pelleted Feed in RAS
DUŠEK, Tomáš
The objective of this thesis for a bachelor´s degree was to experimentally evaluate possibilities of adaptation of northern pike (Esox lucius) for controlled breeding conditions in the RAS and for intake of artificial pelleted feed. Special attention was focused on the influence of light regime on the success of adaptation and the rate of cannibalism. The experiment was divided into six groups with different light regimes (L8 : D16, L4 : D8 : L4 : D8, L12 : D12, L4 : D4 : L4 : D4 : L4 : D4, L16 : D8, L8 : D4 : L8 : D4). Into each group were putted 3,600 pieces of pike larvae, which means 20 pcs/l. Feeding was carried out manually in 15 minutes time interval. Daily mortality was recorded and biometric measurements were conducted. After 15 days, the experiment was evaluated. Adaptation for intake of pelleted feed was successful. As was found out, the light regime has the influence on survival, cannibalism and growth of northern pike in RAS. The highest final piece weight was achieved under the light regime L16 : D8 (W= 0,13135 ? 0,02924 g). The lowest final piece weight was achieved under the light regime L8 : D16 (W= 0,06296 ? 0,01306 g). The highest survival was achieved under the light regime L8 : D4 : L8 : D4 (61,36 %), the worst under the light regime L4 : D8 : L4 : D8 (28,33 %).
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